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[ CVE-2020-17519 · Published 5 Jan 2021 ]

Apache Flink Improper Access Control Vulnerability

Exploited · CISA KEV CVSS 7.5 EPSS 98%No fix listed yet

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2024-05-23
  • EPSS: 98% chance of exploitation in the next 30 days (higher than 100% of CVEs)

[ Description ]Official description

A change introduced in Apache Flink 1.11.0 (and released in 1.11.1 and 1.11.2 as well) allows attackers to read any file on the local filesystem of the JobManager through the REST interface of the JobManager process. Access is restricted to files accessible by the JobManager process. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit b561010b0ee741543c3953306037f00d7a9f0801 from apache/flink:master.

CISA: Apache Flink contains an improper access control vulnerability that allows an attacker to read any file on the local filesystem of the JobManager through its REST interface.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 13 Jun 2024): Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References